Annual report pursuant to Section 13 and 15(d)

STOCK BASED COMPENSATION - Common Stock to Consultants (Details)

v3.20.4
STOCK BASED COMPENSATION - Common Stock to Consultants (Details) - Consultant - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate, Minimum 0.60% 1.40%
Risk-free interest rate, Maximum 0.80% 3.10%
Expected volatility, Minimum 54.30% 52.40%
Expected volatility, Maximum 54.80% 61.50%
Expected life, Minimum (in years) 9 years 4 months 24 days 6 years 2 months 12 days
Expected life, Maximum (in years) 10 years 10 years
Fair value of Common Stock, Minimum $ 1.40  
Fair value of Common Stock, Maximum $ 7.98  
Fair value of Common Stock   $ 3.34